Acclaimed South Korean boy band BTS on Friday released its new studio album, "Map of the Soul: 7," of which more than 4 million copies were sold in advance worldwide.

It is the fourth and longest album to date for the group formed by RM, V, Suga, Jimin, Jin, Jungkook and J-Hope, and includes 20 tracks, including songs "Black Swan," "Interlude: Shadow" and "Outro: Ego," which were released in advance